Driving and stopping mechanism



Sept. llv, 1923. 1,467,584

- B. T.`LEvl-:QUE

DRIVING AND STOPP'ING MECHNS Filed Nov. 12', 917 4 s sneets-sneet 2 gwn MM Vgn Sept. 11', 1923. y 1,461,584

B. T. LEVEQUE Y DRIVING AND sToPPINe MQCHANISM v I Filed Nov. 12 1917 s sheets-Sneet Patented Sept. 11, 1923.

UNITED STTEES FFfic s..l

BERNARD' T. LEVEQUE, VO13" WENHAM, MASSACHUSETTS, ASSIGNOR, BY 'IVIESNE` AS- SIGNMENTS, TO UNITED SHOE MACHINERY CORPORATION, OF ,PATERSON, rNEW' JERSEY, A CORPORATION OF NEW' `JERSEY.

DRIVING AND s'rorriNG MEoHAmsiu.

Application led November 12, 1917. Serial No. 201,542.

To all whom it may concer/n: l

Be it known that I, BERNARD T. LnvnQUr., a citizen of the United States, residing at IVenham, in the county of Essex and State of Massachusetts, have inventedv certain new and useful Improvements in Driving and Stopping Mechanism; and I do hereby declare the following to be a full, clear, and eX- act description of the invention, such as lwill enable others skilled in the art to `which it appertains to make and use the same. l y

The inventionrelates yto driving and stop,- ping mechanism adapted for use in sewing or other machines which are to be stopped with the parts in a predetermined position when the driving power is thrown off.

The object of the invention is-to provide a novel and improved mechanism which will 'enable the operator to readily throw the stopping devices out of active position without throwing on the power, in case he desires to turn the driving shaft by hand, and will also enable him to throw the power olif while the stopping devices remaininactive, in case movement of the driven parts is arrested during their .operation in such position that the return ofthe `stopping devices to active'position is prevented. Y y

To this end the invention contemplatesso connecting the power throw-off and stopping devices that while they normally movetogether yet either may be moved independently in case the other is held from movement. These parts are preferably. thus connectedby a spring which will yield to allow the stopping devices to be independently moved into inactive or stopping position whilethe power throw-off devices are retained in stopping position, or which will yield to allow the power throw-off devices to'be independently moved in a direction to throw off the power when the simultaneous movement of the sto-pping devices into stopping position, which would normally take place, is prevented. The invention also contemplates the provision of a device which maybe manipulated by the operator either to retain the power throw-off devices in stopping position when the stopping devices are to be independentlymoved into starting position, or to move theV power throw-off devices into stopping position when the driven parts are stopped, as by' jamming of the operating parts of the machine, in such position that movement of the and set'forth inthe claims.

Y; The various ,features of the invention will be readily understood from an inspection of the accompanying drawings and the following detailed description of the mechanism illustrated therein.l In the drawings,v Figure l is a sectional elevation on line l, Fig. 3; Fig.f2 is a detail partly in section on line 2, Fig. 1K; Fig.A 3 'is a sectional plan view online', Fig. 4; Fig. 4 is a sectionall View online 4, Fig. 3; Fig. 5 is a sectionaldetail on line 5, Fig. 3; and Figs. 6 and 7 are similar views showingthe parts in different positions.

In the drawings the invention is *shown embodied in a buttonsewing machine the operating'parts of which are mounted in `a frame 2 which is pivoted at 4 on agbase 6. Thevvarious 'parts of the machine are operated from a cam shaft 8 'which makes one revolution 'for' each cycle of the machine. This shaft is driventhrough mechanism which is thrown into operation by manually controlled means such as 'atreadle, and which, upon the release or shifting yof the treadle, operates tostop the shaft and therefore theparts o'f the machine in a predetermined position. As shown, the cam shaft 8 is driven from la' driving shaft 10 through gearing lwhichy is so proportioned that thel The drivingshaft is driven throughY a-beltv` l 22 whichl is shifted from one pulley tothe otherin throwing the power on and off. When the belt is shifted on to the loose pulley to throw ofl" the power the shaft is stop pedinf'a predetermined position by a stop pin 24 which is arrangedto ride on the periphery ofthe stop cam, and is carried upon an arm 26 secured to a shaft 28. The shaft is pressed in a direction to force the end of `the stop pin against the periphery of the stop cam by a spring 30. The pin is moved laterally into and out of the path of the stop cam by a forked arm 32 which is secured to a rock shaft 34 and embraces the end of the arm 26. The rock shaft is forced yieldingly in a direction to bring the stop pin into the path of the cam by la torsional spring 36. The rock shaft is moved in the opposite direction to disengage the stop pin from the cam through a link 38 connecting the arm 32 with one arm of ya bell crank lever 40, the other arm of which is connected by a rod 42 with an operating treadle. The movement of the rock shaft 34 also operates the belt shifter 44. The beltshifter is secured in the upper end 'of an arm 46 which is loosely mounted on the-shaft 34, and is connected to move in unison with the shaft by a spring 48 and a pin 50 which projects from the hub -of the arm into a recess 51 formed in the adjacent end of a sleeve 52 secured to the shaft. One end of thespring is connected to the hub of the arm 46 and the other is connectedy to the sleeve 52.- The spring normally holds the pin in engagement with one side of the recess asin'dicated in Fig. 5, so that the belt shifter arm will move with the rock shaft 34 when this shaft is rocked to move the stop pin into or out of stopping position. This connectiom-however, permits the shaft to be rocked to move the stop pin into inactive or starting position while the vbelt shifter is retained in stopping position with the belt on theloose pulley as indicated in Fig. 7 and also permits the beltvshifter to be moved to shift the belt from the driving pulley tothe loose pulley while-the shaft is retained in position with the stop vpin in starting or running position out of the path of the stop cam.

The means for retaining the driving belt yon the loose pulley while the stop pin is moved laterally out of the path of the stop cam, in case itis desired to turn the driving shaft by'hand, comprises a cam 54 secured to vthe inner end of a rock shaft 56, the outer end of which carries van-operating handle 58. The cam 54 is in the form of a flange projecting from a sleeve secured to the rock shaft, and arranged to engage a lug60 on the rear side of the belt shifter. When the cam is in the position indicated in Figs. 3, 5

and 6, the flange is out of the path of the lug 60, and the belt shifter is free-to move with the rock shaft 34 when it is rocked in starting or stopping the machine.V if the parts are infstopped position indicated in Figs. Y3 and, and the cam 54 is moved into the position indicated in Fig. 7, it will engage the lug 60 on the belt shifter, and retain the belt shifter in this position when the shaft 34 is rocked to move the stop pin into inactive or starting position out of the path of the stop cam. The machine may then be turned by hand, and to enable this to be con- Y veniently done a shaft 62 is connected with the cam shaft vthrough a pinion 64, and is provided on its outer end with a hand Wheel 66. n case the machine stops during its operation, with the parts out of stopping position, the driving belt may be shifted on to the loose pulley while the stop pin remains in running position by turningthe cam -into ythe position indicated in Fig. 7, thus enabling the cam shaft to be turned back or manipulated in restoring running conditions.

In order that the cam shaft may be automatically stopped in a predetermined position by the action of the stop cam on the driving shaft, the cam shaft is provided with a cam surface 68 arranged to engage a roll 70 on the bellcrank 40, and provided with a recess 7 2 which registers with the roll during a part of every fourth revolution yof the d riving lshaft.

In order that the tension may be released when the machine stops, lor when the stopping devices are moved into inactiveposition for hand manipulation of the machine, an arm 7 4 is connected with the bell cranklever 40, and is arranged to engage one arm of a lever 7 6, the other arm ofwhich is arranged to pass between the discs7 8 of the tension, as indicated in Figs. l and 2.

While it is preferred to employ the specilic construction and arrangement of parts shown and ydescribed in embodying ythe invention in the sewing machine indicated in the drawings, it will be understood that this construction and arrangement is not essential to the broader features of the invention, but maybe varied .or modified as found desirable or best suited to the mechanism in which the invention is -to be embodied.

Having explained the 'nature and object of active positionv when the normal accompanyin-gmovement of the other is prevented.

2. Driving and stopping mechanism, Vhaving, in combination, power Vshifting and stopping devices, a vspring connecting the devices to cause them lso-normally Loperate` vin -unison and arranged to -yield'to .permit independent movement-of-one .out of active `position when the normal accompanying movement of the other is prevented.

3. Driving and stopping mechanism, having, in combination, power shifting and stopping devices means connecting the devices to normally operate in unison and to permit independent movement of either when movement of the other is prevented, and manually operable means for retaining the power shifting device in or moving it into stopping position.

4. Driving and stopping mechanism, having, in combination, power shifting and stopping devices, a spring connecting the devices to cause them to normally operate in unison and yielding to permit independent movement of the stopping device into starting position, and a manually operable means for retaining the power shifter in stopping position.

5. Driving and stopping mechanism, having7 in combination, power shifting. and stopping devices, a spring connecting the devices to cause them to normally operate in unison and to permit independent movement of the stopping device into starting position, or independent movement of the power shifting device into stopping position, and manually operable means for retaining the power shifting device in or moving` it into stopping position.

6. Driving and stopping mechanism, having, in combination, a shaft, a stop cam on the shaft, a yielding stop pin, actuating means for shifting the pin into and out of register with the cam, a power shifter, and connections between the shifter and actuating means including a spring arranged to yield to permit independent movement of the pin out of register with the cam.

7. Driving and stopping mechanism, having, in combination, a shaft, a stop cam on the shaft, a yielding stop pin, an actuating shaft connected to move the pin laterally into and out of register with the cam, a power shifter, a connection between the shaft and shifter permitting lost motion, and a spring normally preventing said lost motion.

8i. A driving and stopping mechanism having, in combination, power shifting and stopping devices, a spring connecting the devices to cause them to normally move in unison in starting the driven parts, mechanism included in the driven parts for retaining the stopping devices in inactive and the power shifting devices in active postion during a part of the driving interval, and means for manually moving the power shifting devices into inactive position in case the driven parts stop during the active interval of said mechanism.

9. A driving and stopping mechanism having, in combination, power shiftingand Stopping devices, means for manually moving the stopping devices into starting position, a Spring through which said means also moves the power shifting devices into driving position, and means which may be set by the operator to retain the power shifting devices in stopping position while the stopping devices are moved into inactive position against the tension of the spring.

` BERNARD T. LEVEQUE. 

